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INVESTMENTS (Details) $ / shares in Units, $ in Thousands, shares in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 12, 2021 USD ($) | Jul. 01, 2018 USD ($) | Mar. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) | Mar. 31, 2021 $ / shares | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($)
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Securities, Fair Value |  |  | $ 47,188 |  | $ 47,188 |  |  |  | $ 11,464 |  |
Securities, Fair Value, Cost |  |  | $ 24,200 |  | $ 24,200 |  |  |  |  |  |
Market value of investments to Company's total assets |  |  | 70.60% |  | 70.60% |  |  |  |  |  |
Other Long-term Investments |  |  | $ 2,940 |  | $ 2,940 |  |  |  | 1,283 |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss |  |  | 1,000 |  | 1,000 |  |  |  | 0 |  |
Equity Method Investments |  |  | 596 |  | 596 |  |  |  | 158 |  |
Debt Securities, Available-for-sale, Amortized Cost |  |  | 8,957 |  | 8,957 |  |  |  |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  | 552 | $ 0 | 552 | $ 0 |  |  |  |  |
Proceeds from Sale of Long-term Investments |  |  |  |  | 22,355 | 0 |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | 2,940 | 1,518 | 2,940 | 1,518 |  | $ 1,385 | 1,283 | $ 1,488 | $ 1,404
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount |  |  | 6 | 0 | 6 | 0 |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount |  |  | 542 |  | 542 |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount |  |  | 935 |  | 935 |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount |  |  | 35 | 108 | 158 | 124 |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount |  |  | 1,900 |  | 1,900 |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount |  |  | 1,156 | 63 | 1,156 | 163 |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  | (64) | (91) | 420 | (146) |  |  |  |  |
U.S. Global Investors Funds [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  |  | 7,200 |  | 7,200 |  |  |  | $ 7,000 |  |
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  |  | 10,952 |  | 10,952 |  |  |  |  |  |
Equity Securities Still Held [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, Unrealized Gain (Loss) |  |  | 7,100 |  | 13,600 |  |  |  |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt and Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment Owned, at Cost |  |  | $ 15,000 |  | $ 15,000 |  |  |  |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.00% |  | 8.00% |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares |  |  | $ 2.34 |  | $ 2.34 |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  |  | $ 14,300 |  | $ 14,300 |  |  |  |  |  |
Debt Securities, Available-for-sale, Unrealized Gain | $ 6,900 |  |  |  |  |  |  |  |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment, Common Share Purchase Warrants (in Shares) | shares |  |  | 5 |  | 5 |  |  |  |  |  |
Warrant, Description |  |  |  |  | Each whole warrant, expiring in January 2024, entitles the Company to acquire one common share at a price of $3.00 (Canadian). |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) | $ / shares |  |  |  |  |  |  | $ 3 |  |  |  |
Equity Securities, FV-NI, Cost |  |  |  |  |  |  |  | $ 2,400 |  |  |
Investment Owned, Balance, Shares (in Shares) | shares |  |  |  |  |  |  |  |  | 10 |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent |  | $ 3,200 |  |  |  |  |  |  |  |  |
Proceeds from Sale of Long-term Investments |  |  |  |  | $ 20,600 |  |  |  |  |  |
Equity Securities, FV-NI, Realized Gain |  |  |  |  | 15,000 |  |  |  |  |  |
Thunderbird Entertainment Group [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Cost |  |  | $ 1,500 |  | $ 1,500 |  |  |  |  |  |
Investment Owned, Direct Percentage |  |  | 2.40% |  | 2.40% |  |  |  |  |  |
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  |  | $ 542 |  | $ 542 |  |  |  | $ 806 |  |
Equity Securities, FV-NI, Cost |  |  | 514 |  | 514 |  |  |  |  |  |
Equity Securities, FV-NI, Realized Gain |  |  | $ 538 |  | $ 570 |  |  |  |  |  |
Investment Owned, Direct Percentage |  |  | 1.80% |  | 1.80% |  |  |  | 7.30% |  |
Galileo New Economy Fund LP [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  | $ 596 |  | $ 596 |  |  |  | $ 158 |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 22.20% |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  | (64) | $ (91) | $ 420 | $ (146) |  |  |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Securities, Fair Value |  |  | $ 12,309 |  | $ 12,309 |  |  |  | $ 11,432 |  |
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value |  |  | 26.00% |  | 26.00% |  |  |  | 100.00% |  |
Fair Value, Inputs, Level 1 [Member] | Thunderbird Entertainment Group [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  |  | $ 4,400 |  | $ 4,400 |  |  |  | $ 1,200 |  |
Fair Value, Inputs, Level 1 [Member] | GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  |  | 542 |  | 542 |  |  |  | 774 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Securities, Fair Value |  |  | $ 0 |  | $ 0 |  |  |  | 32 |  |
Percentage of Financial Assets Derived From Level 2 Inputs Measured at Fair Value |  |  | 0.00% |  | 0.00% |  |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Remeasured [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | $ 1,700 |  | $ 1,700 |  |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] | GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  |  |  |  |  |  |  |  | 32 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Securities, Fair Value |  |  | $ 34,879 |  | $ 34,879 |  |  |  | $ 0 |  |
Percentage of Financial Assets Derived From Level 3 Inputs Measured at Fair Value |  |  | 74.00% |  | 74.00% |  |  |  |  |  |
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Remeasured [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | $ 470 |  | $ 470 |  |  |  |  |  |
Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member] | Debentures [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 16,000 |  |  |  |  |  |  |  |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  |  |  | $ 552 |  |  |  |  |  |
Fair Value, Inputs, Level 3 [Member] | Warrant [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Cost | $ 5,900 |  |  |  |  |  |  |  |  |  |

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